Drill attachment.



N0. 686,257. Patntd NOV. l2, |90I.

J. BURGH.

DRILL ATTACHMENT. (pplieacion med my 13, 1901.)

(No Model.)

Jzy@

r l a orgays me Nonms uns w. Puofuwa., wAsmNnTon. n. c.

y UNITED STATES PATENT OFFICE.

JOHN BURGH, OF REYNOLDSVILLE, PENNSYLVANIA.

DRILL ATTACHMENT.

SFEGIFIGATION fog part of Letters Patent No. 686,257, dated. November12, l 901.

Application filed May 13, 1901. Serial No. 60,073. (No model.)

1'0 all whom t may con/ecrit:

Be it known that I, JOHN BURGH,a citizen of the United States, residingat Reynoldsvillc, in the county of Jefferson and State ofPennsylvania,have invented a new and useful Drill Attachment, ot'whichthe followingisaspecification.

This invention relates to attachments for pneumatic and other drills;and it has for its object to provide a device which may be secured tothe drill in such manner as to support the drill and steady it so thatit will :not wabble, as when using small drills or drills of greatlength.

A further object of the invention is to provide a device of this naturewhich may be automatically adjusted in length as the drilling operationproceeds.

Further objects and advantages of the invention will be understood fromthe following description.

ln the drawings forming a portion of this specification, and in whichlike numerals of reference indicate similar parts in the several views,Figure 1 is a view showing the present attachment inlongitudinalsection, excepting the lower end thereof, and illustrating itscooperative relation to the drill, a portion of a drill being shown inelevation. Fig. 2 is a transverse section through the adjustableattaching-clip. Fig. 3 is an elevation of a pneumatic drill providedwith my improved attachment.

In the embodiment of my invention I provide a tubular body portion 5 ofsuitable length and the upper end of which is closed, as shown, whilethe lower end thereof is open, the body portion being straight, and inits operative position it is adapted to stand vertical and with its openend down.

In connection with the tubular body po'rtion 5, which forms the uppermember of the attachment, there is a staff 6, the upper end of which isstraight and is formed to it snugly and slidingly in the tubular member5. Within the member 5 and between the upper end of the member 6 and theclosed end of the member 5 is disposed a helical spring 7, the upper endof which rests against the closed end of the member 5, while the lowerend thereof rests against the inner end of the member 6, and the tensionof this spring is such that it holds the member G yieldably projectedfrom the lower end of the member 5. To limit the movement et' the member6 under the influence of the spring 7, the member 6 is provided with alongitudinal slot 8, which ex tends from a point near to the upper endof the member 6 downwardly thereof, and engaged in this slot or channelis a stop-screw 10, which is passed through a threaded perforation inthe wall of the member 5. When the member 6 moves downwardly oroutwardly under the influence of the helical spring, the end Wall of theslot 8 strikes the stop-screw and is held thereby, so that furthermovement of the member is prevented. The lower end ofthe member 6 isoisct, as shown at 11, and is pointed, so that it may beengaged with thematerial to be drilled in such manner as to prevent slipping sidewise.

In practice this attachment, which is in the nature of a standard, isattached t-o the drill with the member 5 and the upper portion of member6 parallel with the reciprocating plunger 22, which carries thedrill-bit 13, and with the oflset lower end of the member 6 de'- flectedin the direction ot' the drill-bit, so as to lie close thereto.

The standard is attached to a fixed portion of the drill,as the sleeve15, by means of a clip consisting of the plates 17 and 18, which areconnected midway of their ends by the thumb-screw 19. The plates at oneend have the recesses 20 therein to receive the mem ber 5 of thestandard, while at their opposite ends they have the recesses 21, whichreceive the sleeve of the drill, and by tightening the thumb-screw theplates are drawn closely to clamp them tightly against the member 6 andthe sleeve of the drill, so that the drill and standard are held infixed relation. With this construction it will be seen that the standardmay be attached to drills having sleeves of different diameters.

In the use of this device it is adj usted to place, as shown in Fig. 1,and as the drilling proceeds and the distance between the materialdrilled and the sleeve of the drill decreases the member 6 is pressedupwardly into the member 5 of the standard, the resistance of the springbeing such as to prevent jostling of the member 5 up and down during thedrilling operation.

IOO

It will be understood that in practice modiji'cations of the specificconstruction shown may be made and that any suitable materials andproportions may be used for the various parte Without departing from thespirit of the invention. t

What is claimed is- 1. A pneumatic hand-drill having a guide parallelwith and on one side of the plunger, and a spring-projected staff,carried by said guide and adapted to engage the work, for the purposeset forth, substantially as described.

2. A pneumatic hand-drill having a guide parallel with and on one sideof the plunger, a stai carried by said guide and longitudinally movabletherein, and a spring in said guide, bearing on said staff, for theJpurpose set forth, substantially e 5 described.

3. A device of the class described comprising a tubular body having itsupper end closed, a rod slidably disposed in the tubular 4member andhaving its lower end offset and dl'awn to a point, a spring Within thetubular member between the end of the rod and the closed end of thetubular member to hold the rod yieldably projected, and a stop forlimiting the movement of the rod under the iniiuence of the spring. j

4. A device of the class described comprising a tubular body having itsupper end closed, a rod slidably disposed in the body and projecting atits lower end therefrom, a helical spring in the body between the rodand the upper end of the body to hold the rod yieldably projected, saidrod having a groove formed longitudinally thereof and terminating shortof its upper end, and a stopscrew engaged with the body and entering thegroove to limit the movement of the rod.

5. An attachment for pneumatic handdrills, comprising a guide, meaus'tosecure the same to the body of the drill on one side of the plunger ofthe latter, and a springprojected sta carried by said guide,substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

JOHN BURGH. `Witnesses:

A. M. APPLEGATE, CHARLES A. HERPEL.

